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   1 #ifndef ASM_X86_HPET_H
   2 #define ASM_X86_HPET_H
   3
   4 #ifdef CONFIG_HPET_TIMER
   5
   6 #define HPET_MMAP_SIZE          1024
   7
   8 #define HPET_ID                 0x000
   9 #define HPET_PERIOD             0x004
  10 #define HPET_CFG                0x010
  11 #define HPET_STATUS             0x020
  12 #define HPET_COUNTER            0x0f0
  13 #define HPET_T0_CFG             0x100
  14 #define HPET_T0_CMP             0x108
  15 #define HPET_T0_ROUTE           0x110
  16 #define HPET_T1_CFG             0x120
  17 #define HPET_T1_CMP             0x128
  18 #define HPET_T1_ROUTE           0x130
  19 #define HPET_T2_CFG             0x140
  20 #define HPET_T2_CMP             0x148
  21 #define HPET_T2_ROUTE           0x150
  22
  23 #define HPET_ID_REV             0x000000ff
  24 #define HPET_ID_NUMBER          0x00001f00
  25 #define HPET_ID_64BIT           0x00002000
  26 #define HPET_ID_LEGSUP          0x00008000
  27 #define HPET_ID_VENDOR          0xffff0000
  28 #define HPET_ID_NUMBER_SHIFT    8
  29 #define HPET_ID_VENDOR_SHIFT    16
  30
  31 #define HPET_ID_VENDOR_8086     0x8086
  32
  33 #define HPET_CFG_ENABLE         0x001
  34 #define HPET_CFG_LEGACY         0x002
  35 #define HPET_LEGACY_8254        2
  36 #define HPET_LEGACY_RTC         8
  37
  38 #define HPET_TN_LEVEL           0x0002
  39 #define HPET_TN_ENABLE          0x0004
  40 #define HPET_TN_PERIODIC        0x0008
  41 #define HPET_TN_PERIODIC_CAP    0x0010
  42 #define HPET_TN_64BIT_CAP       0x0020
  43 #define HPET_TN_SETVAL          0x0040
  44 #define HPET_TN_32BIT           0x0100
  45 #define HPET_TN_ROUTE           0x3e00
  46 #define HPET_TN_FSB             0x4000
  47 #define HPET_TN_FSB_CAP         0x8000
  48 #define HPET_TN_ROUTE_SHIFT     9
  49
  50 /* Max HPET Period is 10^8 femto sec as in HPET spec */
  51 #define HPET_MAX_PERIOD         100000000UL
  52 /*
  53  * Min HPET period is 10^5 femto sec just for safety. If it is less than this,
  54  * then 32 bit HPET counter wrapsaround in less than 0.5 sec.
  55  */
  56 #define HPET_MIN_PERIOD         100000UL
  57
  58 /* hpet memory map physical address */
  59 extern unsigned long hpet_address;
  60 extern unsigned long force_hpet_address;
  61 extern int hpet_force_user;
  62 extern int is_hpet_enabled(void);
  63 extern int hpet_enable(void);
  64 extern void hpet_disable(void);
  65 extern unsigned long hpet_readl(unsigned long a);
  66 extern void force_hpet_resume(void);
  67
  68 #ifdef CONFIG_HPET_EMULATE_RTC
  69
  70 #include <linux/interrupt.h>
  71
  72 typedef irqreturn_t (*rtc_irq_handler)(int interrupt, void *cookie);
  73 extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask);
  74 extern int hpet_set_rtc_irq_bit(unsigned long bit_mask);
  75 extern int hpet_set_alarm_time(unsigned char hrs, unsigned char min,
  76                                unsigned char sec);
  77 extern int hpet_set_periodic_freq(unsigned long freq);
  78 extern int hpet_rtc_dropped_irq(void);
  79 extern int hpet_rtc_timer_init(void);
  80 extern irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id);
  81 extern int hpet_register_irq_handler(rtc_irq_handler handler);
  82 extern void hpet_unregister_irq_handler(rtc_irq_handler handler);
  83
  84 #endif /* CONFIG_HPET_EMULATE_RTC */
  85
  86 #else /* CONFIG_HPET_TIMER */
  87
  88 static inline int hpet_enable(void) { return 0; }
  89 static inline unsigned long hpet_readl(unsigned long a) { return 0; }
  90 static inline int is_hpet_enabled(void) { return 0; }
  91
  92 #endif
  93 #endif /* ASM_X86_HPET_H */